stevens



(No Model.) i

Y A. 85A. L. STEVENS.

STEAM ROK DRILL. N0. 293,371. Patented Feb. 1.12.1884:lr A Q F N1 NI 7gM 2o f is a perspective view ofthe brass valve-cylinivi-TED STATES Armarrrrcn.

STEAM 'ROCK-DRILL.

. SPECIFICATION forming part of Letters Patent No. 293-,3'71, datedFebruary 12', 1884. Application filed June 27, 1883. (No model.)

To a/ZZ whom, it may concern:

Be it known that we, AMos STEVENS and ARTHUR L. Srnvns, of the city ofPhiladela oo `. is a cross-section of same on line t t.

phia, county of Philadelphia, and State of Pennsylvania, have inventedan Improvement in Steam Rock-Drills, of which the following is aspecification.

Our invention has reference to steam rockdrills and it consists incertain improvements fully set forth in the following specification, andshown in the accompanying drawings, which form part thereof.

In the drawings, Figure 1 is a sectional elevation of our improved steamrock-drill on line Fig. 2 is a cross-section of same on line z z. Fig. 3is a cross-section of the valve mech-- anism on line y y. Fig. 4. is asection or a part of Vthe valve mechanism on line c c, especiallyadapted to reciprocate the main steamvalve and-vary the stroke of thedrill. Fig. 5

der. Fig. 6 is a side elevation of same. Fig. 7 is a cross-section online w m. Fig. 8 is a perspectiveview representing the steam-ports forthe steam-cylinder. Fig. 9 is a cross-section on line rw w, and showsthe ratchet mechanism to rotate the drill-bit. Fig. 10 is Ian elevationof the slotted cylinder by which the drill-bit is intermittentlyrotated. Fig. 11 is a cross-section of the drill on line s s. Fig. 12Fig. 13

- is an elevation of the upper steam-piston removed from its piston, andFig. 14 is a plan and elevation of the bisected ring used to hold thesaid upper piston from moving upon the piston-rod. A is thesteam-cylinder, and is made of a casting bored entirely through, beingafterward subdivided. In the middle of this cylinder I placea ring, B',and secure it in place by screws B2. 4

C is the piston-rod, and is made solid with the drillchuck 0*, onepiston, C', a-nd the tapering or cam extension C G2. The'upper end ofthis piston-rod C is passed through the holein the ring B', which itiits nicely, andthe piston C' works in the lower chamber, B, of thecylinder A. A divided plug,-E, is then placed around the piston-rod, andits enlarged end is received in a groove, e, in the bottom of the E3,which presses against a ilange, e'.

(see Figs. i and 1i.) Then the' 1 and 12,) and is pressed in by ascrew-ring, i

Facking is placed between the glands E2 and bushing E, and thereby makesa steam-tight joint. The split ring c (see Fig. 14) is placed upon theupper end ofthe piston-rod and in a groove, G3. The loose piston C2 isthen placed on the piston-rod and againstthe ring c' inclosing it, andis secured in place by a pin, c2, or other equivalent device. The upperend of the cylinder A is closed by the head A', which carries the valvemechanism L, adapted to operate the main valve. projects through thishead A', and is provided with a feather, OS, which works in obliqueslots g in the cylinder G, which is secured to the ratchet-wheel G',free to rotate in one direction, but held from rotation in the otherdirection by pawls g' and springs g2. This cylinder G is supported onone end by the head A' and on the other by a case, A2, secured to saidhead, and is kept iu place by a packingblock, At, preferably ofvulcanized ber, held in aga-inst the end of cylinder A2 by a cap, A,through which the bolts F F pass. From this it is seen that all of theparts ofthe main steamcylindervia A,E, E', A', A2,'and Ail-are heldtogether by said boltsF alone, this greatly simplifying the constructionof rock-drills gen`y erally. The cylinder A is grooved on each side toreceive the guides 71l of support H2, which is provided with a` nut, H3,through which the screw H works to raise or lower the drill, the saidscrew being carried by an eX- tension on the cap A, and provided with acrank, H. v

b b are the, steam-ports which open from the steam-valve, andrespectively extend to the tops of each cylinder or chamber B and theThe cam-extension CG CT A bottom thereof, one of the latter entering thei lower chamber, B, a short distance from the bottom, as shownin dottedlines, Fig. 1,so as t'o' enable the piston to cushion on liveor exhaustIQO steam, asset forth in another pending appl-ication of ours.

I is the steam-chest, and is provided with the steam passage-way I', towhich steam is admitted by a steam-valve, O, located in saidpassage-way, and a brass cylinder or valvecase, J. This cylinder J isprovided withtwo steamports,j, to admit steam, and two steamports, .7",to allow it to pass into or fromthe steam-ports b, and thence to or fromthe chambers B B. It is also provided with an exhaust-port, jz, whichopens into the exhaust Q. The ports j open into the steam passage- Thiscase J is clamped between two disks of vulcanized liber or any othersuitable packing, Ze, and the end closed by a screwplug, K2. A

N is a disk having an `exhaust-port, a', and

two steam-ports, a, the former of 'which is connected with theexhaust-port .7'2 by asgro'ove or port, i, (see Fig. 6,) and steam-portsn a are respectively connected with each end of the case J by grooves orports i i. (See Fig. 5.) The head A carries a brass cylinder, L,Aarranged at right angles to the piston-rod, and provided with steam-ports Z Z and exhaustport Z2, substantially as in the .case J, the saidports opening into the ports n n. The ports Z Z open into thesteamgpassage-way I.

M is a cylindrical steam-valve, having cylinders M M and M2, the twoformer of which control the admittance of steam by portsZ Z,

and the latterof which puts the steam-ports n alternately intocommunication with the exhaust-port Z2, or, in vother words, thesteamports a with exhaust-port n. These cylinders are connected togetherby body m, which extends below to form a screw-shank, M, which works ina nut, M2 which is adapted to vertical movement, but not rotarymovement, as it is kept from turning by a feather, mj, and groove m2.This nut rests upon the cam-extension C6 C7. The top of the valve M isprovided with extensions P, between which work a flat or squareextension-piece, P, secured tol or formed integral with a disk, p, andhead p', held in the cap R by a gland, R. By turning the extension `Pthevalve M may be raised or lowered with respect to the case L by serewingit more or less into the nut M4.

K is the main steam-valve, and is similar to valve M, it havingcylinders K K and K2, connected together lby body 7a, and works in thecase J and between the packing ZZ.

The pistons C C have their diameters reduced, as at c, to allow thepassage of steam from the ports to start said pistons'and pre.-

d vent the ports being entirely closed.

The operation is as follows: rlhe various parts being as shown in Fig.l, and steam being admitted from pipe Q by valve O, it passes throughvalve K to the upper ends of each chamber B,forcing down the pistons.During this operation the cam-extension C6 C7 slowly moves the valve Mup and rotates the cylinder G. As soon as the valve M is raisedsufficiently high to admit steam from upper port, Z, steam passes alongport at to the end of case J and throws the valve K to the other end of.said case, yand now the steam is admitted to the bottom ends of thechambers, and that above the piston passes off by exhaustport j2, andwhen said valve K shifted its position the exhaust-steam between its endand packing k is passed by ports i n Z Z2 a n2 to exhaust-port ji.During the upward stroke of the piston-rod it makes a part of arevolution, as the ratchet-wheel G is prevented from rotating, and hencethe feather C8 follows the oblique slot g. A slight steam-pressure onthe top of the valve M always insures its being worked by thecam-extension. the drill may be regulated by turning the extension P, asthat changes the position of the The stroke of valve M, causing it tovary the time of admission of steamto the rear end of the valve K, and

thereby vary the time of admission of steam below4 the pistons tolengthen or shorten the stroke. I

VVhile we prefer the constructions shown, We do not limit ourselves toall of the details, as they may be modied in various ways withoutdeparting from our invention.

In this application we do not claim the specific construction ofthedrill-chuck, as that will form subject-matter of a future application.

We are aware of the patent to Githens,

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August 5, 1875, and claim nothing therein y shown or described, thebolts in that patent being adapted to transmit motion to the bufferheadwhen the front cylinder-head is struck by the piston, and to hold thebuffer-head rigid whenV the rear cylinder-head is struck by the piston,to the end that both heads shall have end-play or spring motion.

Having now described our invention, what we claim as new, and desire tosecure by Letstroke, substantially as and for the purpose specied.

3. The combination of a cylinder, ring-piece B', piston-rod O, havingsolid piston G, loose pistonG'Z, split bushing E, head E, E2, ring E, achuck made solid on the end of said piston-rod, cam-.extension CG7having feather CS, cylinder G, having oblique slots g, ratchet-wheelG', and one or more pawls, y', substantially as and for the purposespecified.

4. The combination of a cylinder, ring-piece B, piston-rod C, havingsolid piston O, loose piston C2, split bushing E, head E', split glandE2, ring E3, a chuck made solid on the end of said piston-rod,cam-extension C6 C7, having feather C8, cylinder G, having oblique slotsg, ratchet-wheel G', one or more pawls, g', parts A A2, and cap A, andbolts F F, substantially as and'for the purpose specified.

5. 'Ihe combination of a cylinder, ri 11g-piece B', pistou-rod C, havingsolid piston C, loose piston'Ci, split bushing E, head E', split glandFF, ring E, a chuck made solid on the end of said piston-rod,cam-extension G6 C7, having feather G3, cylinder G, having oblique slotsg, ratchet-wheel Gr, one or more pawls, g, parts A A2 and cap A, packingA, and bolts F F, substantially as and for the purpose specified.

6. The combination of cylinder A, ringpiece B, piston-rod C, havingsolid piston C, loose piston C2, bisected ring c', and means to securesaid piston C2 on the piston-rod, substantially as and for the purposespecified.

7. The combination of cylinder A, having steam-ports b, ring-piece B',piston-rod C, having solid piston C', loose piston C2, bisected ring c',and means to secure said piston C2 on the piston-rod, the said pistonshaving a portion of their length reduced in diameter, as at c,substantially as and for the purpose specified.

8. A cylinder, in combination with a piston-rodhavingasolid piston andchuck formed upon it, a split bushing to nt the end of the cylinder andencircle the piston-rod, a head to hold said split bushing together andin place, and means to make a'steam-tight joint, substantially as andfor-the purpose specified.

9. The combination of cylinder A, having steam-ports b, the lower ofwhich enters the lower chamber, B, ofthe cylinder a short distance aboveits bottoni, to enable the piston to cushion on live or exhaust steam,ringpiece B, piston-rod C, having solid piston G, loose piston G2,bisected ring c, and means to secure said piston@2 on the piston-rod,the

,said pistons having a portion of their length reduced in diameter, asat c, substantially as and for the purpose specified.

10. In a rock-drill, a piston-rod extended to form cam-extension CC",vin combination with a piston steam-valve to admit steam to thecylinders aboveandbelow the pistons, and an auxiliary valve mechanismcontrolled by said cam-extension toA control or govern the time ofadmittance of steam to each end of said piston steam-valve to cause itto reciprocate, substantially as and for the purpose specified.

11: In a rock-drill, a piston-rod extended to form cam-extension C C7,in combination split gland l with a piston steam-valve to admit. steamto the cylinders above and below the pistons, an auxiliary valvemechanism controlled by said cam-extension to control or govern the timeof admittance of steam toV each of said piston steam-valves, to cause itto reciprocate, and mechanism, substantially asset forth, to vary thestroke ofthe piston-rod, substantially as and for the purpose specied.

12. In a rock-drill, a piston-rod provided with the cam-extension C6 C7,projecting from the rear end of the cylinder and inclosed in a separatecase, in combination with said cylinder-casc, valve mechanism actuatedby said cam-extension to lcontrol the admittance of steam to thecylinder above and below the piston, and means, substantially'as setforth, controlled by the reciprocations of `said cameXtension, to impartan intermittent rotary motion to said piston-rod, substantially as and`for the purpose specified.

13. In a rock-drill, the cam-extension C QT, in combination with valvemechanism I and L, when constructed as shown, substantially as and forthe purpose specied.

14. In a rock-drill, the cam-extension G6 C?, in combination with valveM, having screw M3, ports Z Z Z2, valve K, ports j j j n n t' t" t2,-nut M4, and means to screw said screw M3 more or less into the said nutM4, substan-` tially as and for the purpose specified.

15. In a rock-drill, the cam-extension C C7,

`in combination with valve M, ports Z Z Z2,

valve K, ports 7' 7",7'2 au t' t" t2, packing 7c Zt', to receive theconcussion of the valve K in its reciprocations, substantially as andfor the purpose specified.

16. In a rock-drill, the cam-extension C C7, in combination with valveM, ports Z Z' Z2, valve K, ports j j jg n a i i i2, passage-way I, andsteam-valve O in said passage-way, to admit steam from the steam-mainsimultaneously to both valves K and M, substantially as and for thepurpose specified.

17. The combination of cylinder A, piston' rodl C, a rear cylinder-head,and split bushing E with head E and longitudinal binding-boltsFF,substantially as and for the purpose specified.

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41S. `Ihe combination of cylinder A, piston C, arear'c'ylinder-head, andsplit bushing E with head E', a packing-gland, E2, and longitudinalbinding-bolts FF, substantially as and for the purpose specied.

19. The combination of cylinder A, pistonrod Q, a rear cylinder-head,and split bushing E with head E, a split packing-gland, E, ring E, andlongitudinal binding-bolts F F, substantially as and for the purposespecified.

In testimony of which invention we hereunto set our hands.

AMOS STEVENS.

ARTHUR L. STEVENS.

XVitnesses: y

WILLIAM MOWADE, Crus. Orrrz.

